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Various nitrogen-fused tricyclic compounds, having benzoindolizidine and benzopyrrolizidines ring systems were synthesized via ene–ene metathesis using the first and second-generation Grubbs catalyst. The ene–ene metathesis proceeded smoothly in refluxing CH 2 Cl 2 with 3.0mol% of G 1 , giving good yields (78–86%) of the benzoindolizidine products 12a,b. The benzopyrrolizidine...
γ-Acetylenic carboxylic acids are cyclized to spirolactones under mild conditions, in the presence of Ag 2 CO 3 catalyst. The corresponding spiro-5-alkylidene-γ-butyrolactones were isolated in high yields, and this process constitutes an easy and efficient route to analogous structures of natural products of biological interest.
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